[test] Add some already-fixed crashers

Author: hamishknight

test/SourceKit/Refactoring/issue-51844.swift

@@ -0,0 +1,13 @@
+// https://github.com/swiftlang/swift/issues/51844
+
+func doStuff(_ handler: () -> Void) { }
+
+// CHECK: [[@LINE+1]]:17-[[@LINE+1]]:22 source.refactoring.range.kind.basename
+func merge<T>(_ param: T) {
+  func makeHandler(_ successHandler: (T) -> T) -> () -> Void {
+      return {}
+  }
+  // RUN: %sourcekitd-test -req=find-local-rename-ranges -pos=%(line+1):42 %s -- %s | %FileCheck %s
+  doStufff(makeHandler { (success: T) in param})
+  // CHECK: [[@LINE-1]]:42-[[@LINE-1]]:47 source.refactoring.range.kind.basename
+}

validation-test/IDE/crashers_fixed/issue-65817.swift

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+// RUN: %target-swift-ide-test -code-completion -batch-code-completion -skip-filecheck -code-completion-diagnostics -source-filename %s
+// https://github.com/swiftlang/swift/issues/65817
+protocol Publisher<Output, Failure> {
+  associatedtype Output
+  associatedtype Failure : Error
+}
+func pnReceive<P: Publisher>(_ publisher: P) where P.Failure == Never
+func test() {
+  pnReceive(#^COMPLETE^#) { }
+}

validation-test/IDE/crashers_fixed/issue-75898.swift

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+// RUN: %target-swift-ide-test -code-completion -batch-code-completion -skip-filecheck -code-completion-diagnostics -source-filename %s
+// https://github.com/swiftlang/swift/issues/75898
+extension Result {
+  typealias Value = Success
+
+  init(value: Value) {}
+
+  func tryMap() {
+    return flatMap { value in }#^COMPLETE^#
+  }
+}